Improvement in globe-shades for lamps



H. WHITNEY.

Lamp Shade.

Patented Feb. 23.1869.

N PEIERS PlMo-Lithognqber. Wnlhinglon, I16.

%nitvd w r W HENRY WHITNEY, OF EAST CAMBRIDGE, MASSACHUSETTS.

I Letters Patent No. 87,128, dated February 23, 1869. I

IMPROVEMENT IN GLOBE-SHADES FOR LAMPS.-

The Schedule referred to in these Letters Patent and making part of the name.

To all persons to whom these presents may come Be it known that I, HENRY WHITNEY, of East 0ambridge,;in the county of Middlesex, and State of Massachusetts, have invented a' new and useful Improvement in Glass Globe-Shades for Lamps; and I do hereby declare the same to be fully described in the following specification,and-represented in the accompanying drawings, of which- Figure 1 is a front elevation, and

Figure 2, a vertical section of one of my improved shades.

Instead'of making the shade in the-precise form of a hollow globe, with holes .at top and bottom, as it is usually formed, I construct'it with a series of annular mouldings, corrugations,'or projections, each being semicircular or elliptical, or approximately so, in transverse section, and being extended entirely around the. shade, in a plane at right angles with its vertical axis.

lnthe drawings, these corrugations or annular projections (ea-ch of which has a concave-convex section) are shown at a a a a a, that of the greatest diameter being at the middle, and those of the least radius being at or near the ends of theshade.

In its general form, the shade is globular, or may be ovoidal or ellipsoidal, or thereabout.

By being made with the series of annular mouldings or concavo-convex projections, formed and arranged as described and represented, the lamp-shade is not only rendered very much stronger, so as to be less liable to be broken in transit, or otherwise, or to be cracked by sudden changes of temperature to which it may be subjected, but it becomes a better diffuser of light, for, while surrounding the flame of a lamp or gas-burner,

' it exposes to such flame a larger amount of refracting and radiating-surface, with a variety of curves, by which the rays of light intercepted are diffused in more directions, or in more ways, and are refracted to a greater extent than they would be by a common glass globe shade of like diameter. The interior surface of the shade I usually grind or roughen, as is customary with the ordinary globeshade.

I am aware of the glass lamp-chimneys as represented in the United States patents, Nos. 38,492, 55,436, and 55,450, the first referred to beingmade with vertical corrugations, like those of cantaloupe or muskmelon, and the others having spiral groovesor corrugations. I therefore make no claim to such, and, besides, my invention has no reference to a lampchiinney, but refers particularly to a glass globe lampshade, to encompass a lamp-chimney when in use.

The corrugations of my globe-shade are not only arranged with their junctions in horizontal orparallel planes, but they are so disposed that they constantly diminish in diameter from the middle, one to each of the extremes of the shade. Under this arrangement,

there is a better and more extensive diflusion of the light than takes place in either of the chimneys as mentioned; and, besides, the shade, by being globular; as well as corrugated, has the advantagesbf the ordinary plane globular shade coupled with others incident to the corrugations.

I therefore claim, as an improved manufacture- A corrugated globular lamp-shade, having the cor rugations arranged parallel to each other, and to diminish in diameter from the middle to the openings or extremes of the shade, the whole being as described and represented. HENRY WHITNEY. Witnesses:

It. H.- EDDY, SAMUEL N. PIBER'. 

